]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - Makefile
ipv6/addrconf: only check invalid header values when NETLINK_F_STRICT_CHK is set
[mirror_ubuntu-eoan-kernel.git] / Makefile
1 # SPDX-License-Identifier: GPL-2.0
2 VERSION = 5
3 PATCHLEVEL = 3
4 SUBLEVEL = 18
5 EXTRAVERSION =
6 NAME = Bobtail Squid
7
8 # *DOCUMENTATION*
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
13
14 # That's our default target when none is given on the command line
15 PHONY := _all
16 _all:
17
18 # We are using a recursive build, so we need to do a little thinking
19 # to get the ordering right.
20 #
21 # Most importantly: sub-Makefiles should only ever modify files in
22 # their own directory. If in some directory we have a dependency on
23 # a file in another dir (which doesn't happen often, but it's often
24 # unavoidable when linking the built-in.a targets which finally
25 # turn into vmlinux), we will call a sub make in that other dir, and
26 # after that we are sure that everything which is in that other dir
27 # is now up to date.
28 #
29 # The only cases where we need to modify files which have global
30 # effects are thus separated out and done before the recursive
31 # descending is started. They are now explicitly listed as the
32 # prepare rule.
33
34 ifneq ($(sub_make_done),1)
35
36 # Do not use make's built-in rules and variables
37 # (this increases performance and avoids hard-to-debug behaviour)
38 MAKEFLAGS += -rR
39
40 # Avoid funny character set dependencies
41 unexport LC_ALL
42 LC_COLLATE=C
43 LC_NUMERIC=C
44 export LC_COLLATE LC_NUMERIC
45
46 # Avoid interference with shell env settings
47 unexport GREP_OPTIONS
48
49 # Beautify output
50 # ---------------------------------------------------------------------------
51 #
52 # Normally, we echo the whole command before executing it. By making
53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
54 # $(quiet) to choose other forms of output instead, e.g.
55 #
56 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
57 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
58 #
59 # If $(quiet) is empty, the whole command will be printed.
60 # If it is set to "quiet_", only the short version will be printed.
61 # If it is set to "silent_", nothing will be printed at all, since
62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
63 #
64 # A simple variant is to prefix commands with $(Q) - that's useful
65 # for commands that shall be hidden in non-verbose mode.
66 #
67 # $(Q)ln $@ :<
68 #
69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
71 #
72 # To put more focus on warnings, be less verbose as default
73 # Use 'make V=1' to see the full commands
74
75 ifeq ("$(origin V)", "command line")
76 KBUILD_VERBOSE = $(V)
77 endif
78 ifndef KBUILD_VERBOSE
79 KBUILD_VERBOSE = 0
80 endif
81
82 ifeq ($(KBUILD_VERBOSE),1)
83 quiet =
84 Q =
85 else
86 quiet=quiet_
87 Q = @
88 endif
89
90 # If the user is running make -s (silent mode), suppress echoing of
91 # commands
92
93 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
94 quiet=silent_
95 endif
96
97 export quiet Q KBUILD_VERBOSE
98
99 # Kbuild will save output files in the current working directory.
100 # This does not need to match to the root of the kernel source tree.
101 #
102 # For example, you can do this:
103 #
104 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
105 #
106 # If you want to save output files in a different location, there are
107 # two syntaxes to specify it.
108 #
109 # 1) O=
110 # Use "make O=dir/to/store/output/files/"
111 #
112 # 2) Set KBUILD_OUTPUT
113 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
114 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
115 #
116 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
117 # variable.
118
119 # Do we want to change the working directory?
120 ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
122 endif
123
124 ifneq ($(KBUILD_OUTPUT),)
125 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
126 # expand a shell special character '~'. We use a somewhat tedious way here.
127 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
128 $(if $(abs_objtree),, \
129 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
130
131 # $(realpath ...) resolves symlinks
132 abs_objtree := $(realpath $(abs_objtree))
133 else
134 abs_objtree := $(CURDIR)
135 endif # ifneq ($(KBUILD_OUTPUT),)
136
137 ifeq ($(abs_objtree),$(CURDIR))
138 # Suppress "Entering directory ..." unless we are changing the work directory.
139 MAKEFLAGS += --no-print-directory
140 else
141 need-sub-make := 1
142 endif
143
144 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
145
146 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
147 $(error source directory cannot contain spaces or colons)
148 endif
149
150 ifneq ($(abs_srctree),$(abs_objtree))
151 # Look for make include files relative to root of kernel src
152 #
153 # This does not become effective immediately because MAKEFLAGS is re-parsed
154 # once after the Makefile is read. We need to invoke sub-make.
155 MAKEFLAGS += --include-dir=$(abs_srctree)
156 need-sub-make := 1
157 endif
158
159 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
160 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
161 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
162 need-sub-make := 1
163 # Cancel implicit rules for this Makefile.
164 $(lastword $(MAKEFILE_LIST)): ;
165 endif
166
167 export abs_srctree abs_objtree
168 export sub_make_done := 1
169
170 ifeq ($(need-sub-make),1)
171
172 PHONY += $(MAKECMDGOALS) sub-make
173
174 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
175 @:
176
177 # Invoke a second make in the output directory, passing relevant variables
178 sub-make:
179 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
180
181 endif # need-sub-make
182 endif # sub_make_done
183
184 # We process the rest of the Makefile if this is the final invocation of make
185 ifeq ($(need-sub-make),)
186
187 # Do not print "Entering directory ...",
188 # but we want to display it when entering to the output directory
189 # so that IDEs/editors are able to understand relative filenames.
190 MAKEFLAGS += --no-print-directory
191
192 # Call a source code checker (by default, "sparse") as part of the
193 # C compilation.
194 #
195 # Use 'make C=1' to enable checking of only re-compiled files.
196 # Use 'make C=2' to enable checking of *all* source files, regardless
197 # of whether they are re-compiled or not.
198 #
199 # See the file "Documentation/dev-tools/sparse.rst" for more details,
200 # including where to get the "sparse" utility.
201
202 ifeq ("$(origin C)", "command line")
203 KBUILD_CHECKSRC = $(C)
204 endif
205 ifndef KBUILD_CHECKSRC
206 KBUILD_CHECKSRC = 0
207 endif
208
209 # Call message checker as part of the C compilation
210 #
211 # Use 'make D=1' to enable checking
212 # Use 'make D=2' to create the message catalog
213
214 ifdef D
215 ifeq ("$(origin D)", "command line")
216 KBUILD_KMSG_CHECK = $(D)
217 endif
218 endif
219 ifndef KBUILD_KMSG_CHECK
220 KBUILD_KMSG_CHECK = 0
221 endif
222
223 # Use make M=dir to specify directory of external module to build
224 # Old syntax make ... SUBDIRS=$PWD is still supported
225 # Setting the environment variable KBUILD_EXTMOD take precedence
226 ifdef SUBDIRS
227 $(warning ================= WARNING ================)
228 $(warning 'SUBDIRS' will be removed after Linux 5.3)
229 $(warning )
230 $(warning If you are building an individual subdirectory)
231 $(warning in the kernel tree, you can do like this:)
232 $(warning $$ make path/to/dir/you/want/to/build/)
233 $(warning (Do not forget the trailing slash))
234 $(warning )
235 $(warning If you are building an external module,)
236 $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
237 $(warning ==========================================)
238 KBUILD_EXTMOD ?= $(SUBDIRS)
239 endif
240
241 ifeq ("$(origin M)", "command line")
242 KBUILD_EXTMOD := $(M)
243 endif
244
245 export KBUILD_CHECKSRC KBUILD_EXTMOD
246
247 ifeq ($(abs_srctree),$(abs_objtree))
248 # building in the source tree
249 srctree := .
250 building_out_of_srctree :=
251 else
252 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
253 # building in a subdirectory of the source tree
254 srctree := ..
255 else
256 srctree := $(abs_srctree)
257 endif
258 building_out_of_srctree := 1
259 endif
260
261 ifneq ($(KBUILD_ABS_SRCTREE),)
262 srctree := $(abs_srctree)
263 endif
264
265 objtree := .
266 VPATH := $(srctree)
267
268 export building_out_of_srctree srctree objtree VPATH
269
270 # To make sure we do not include .config for any of the *config targets
271 # catch them early, and hand them over to scripts/kconfig/Makefile
272 # It is allowed to specify more targets when calling make, including
273 # mixing *config targets and build targets.
274 # For example 'make oldconfig all'.
275 # Detect when mixed targets is specified, and make a second invocation
276 # of make so .config is not included in this case either (for *config).
277
278 version_h := include/generated/uapi/linux/version.h
279 old_version_h := include/linux/version.h
280
281 clean-targets := %clean mrproper cleandocs
282 no-dot-config-targets := $(clean-targets) \
283 cscope gtags TAGS tags help% %docs check% coccicheck \
284 $(version_h) headers headers_% archheaders archscripts \
285 %asm-generic kernelversion %src-pkg
286 no-sync-config-targets := $(no-dot-config-targets) install %install \
287 kernelrelease
288
289 config-targets := 0
290 mixed-targets := 0
291 dot-config := 1
292 may-sync-config := 1
293
294 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
295 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
296 dot-config := 0
297 endif
298 endif
299
300 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
301 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
302 may-sync-config := 0
303 endif
304 endif
305
306 ifneq ($(KBUILD_EXTMOD),)
307 may-sync-config := 0
308 endif
309
310 ifeq ($(KBUILD_EXTMOD),)
311 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
312 config-targets := 1
313 ifneq ($(words $(MAKECMDGOALS)),1)
314 mixed-targets := 1
315 endif
316 endif
317 endif
318
319 # For "make -j clean all", "make -j mrproper defconfig all", etc.
320 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
321 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
322 mixed-targets := 1
323 endif
324 endif
325
326 # install and modules_install need also be processed one by one
327 ifneq ($(filter install,$(MAKECMDGOALS)),)
328 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
329 mixed-targets := 1
330 endif
331 endif
332
333 ifeq ($(mixed-targets),1)
334 # ===========================================================================
335 # We're called with mixed targets (*config and build targets).
336 # Handle them one by one.
337
338 PHONY += $(MAKECMDGOALS) __build_one_by_one
339
340 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
341 @:
342
343 __build_one_by_one:
344 $(Q)set -e; \
345 for i in $(MAKECMDGOALS); do \
346 $(MAKE) -f $(srctree)/Makefile $$i; \
347 done
348
349 else
350
351 include scripts/Kbuild.include
352
353 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
354 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
355 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
356 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
357
358 include scripts/subarch.include
359
360 # Cross compiling and selecting different set of gcc/bin-utils
361 # ---------------------------------------------------------------------------
362 #
363 # When performing cross compilation for other architectures ARCH shall be set
364 # to the target architecture. (See arch/* for the possibilities).
365 # ARCH can be set during invocation of make:
366 # make ARCH=ia64
367 # Another way is to have ARCH set in the environment.
368 # The default ARCH is the host where make is executed.
369
370 # CROSS_COMPILE specify the prefix used for all executables used
371 # during compilation. Only gcc and related bin-utils executables
372 # are prefixed with $(CROSS_COMPILE).
373 # CROSS_COMPILE can be set on the command line
374 # make CROSS_COMPILE=ia64-linux-
375 # Alternatively CROSS_COMPILE can be set in the environment.
376 # Default value for CROSS_COMPILE is not to prefix executables
377 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
378 ARCH ?= $(SUBARCH)
379
380 # Architecture as present in compile.h
381 UTS_MACHINE := $(ARCH)
382 SRCARCH := $(ARCH)
383
384 # Additional ARCH settings for x86
385 ifeq ($(ARCH),i386)
386 SRCARCH := x86
387 endif
388 ifeq ($(ARCH),x86_64)
389 SRCARCH := x86
390 endif
391
392 # Additional ARCH settings for sparc
393 ifeq ($(ARCH),sparc32)
394 SRCARCH := sparc
395 endif
396 ifeq ($(ARCH),sparc64)
397 SRCARCH := sparc
398 endif
399
400 # Additional ARCH settings for sh
401 ifeq ($(ARCH),sh64)
402 SRCARCH := sh
403 endif
404
405 KCONFIG_CONFIG ?= .config
406 export KCONFIG_CONFIG
407
408 # SHELL used by kbuild
409 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
410 else if [ -x /bin/bash ]; then echo /bin/bash; \
411 else echo sh; fi ; fi)
412
413 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
414 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
415 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
416
417 HOSTCC = gcc
418 HOSTCXX = g++
419 KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
420 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
421 $(HOSTCFLAGS)
422 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
423 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
424 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
425
426 # Make variables (CC, etc...)
427 AS = $(CROSS_COMPILE)as
428 LD = $(CROSS_COMPILE)ld
429 CC = $(CROSS_COMPILE)gcc
430 CPP = $(CC) -E
431 AR = $(CROSS_COMPILE)ar
432 NM = $(CROSS_COMPILE)nm
433 STRIP = $(CROSS_COMPILE)strip
434 OBJCOPY = $(CROSS_COMPILE)objcopy
435 OBJDUMP = $(CROSS_COMPILE)objdump
436 OBJSIZE = $(CROSS_COMPILE)size
437 PAHOLE = pahole
438 LEX = flex
439 YACC = bison
440 AWK = awk
441 INSTALLKERNEL := installkernel
442 DEPMOD = /sbin/depmod
443 PERL = perl
444 PYTHON = python
445 PYTHON2 = python2
446 PYTHON3 = python3
447 CHECK = sparse
448
449 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
450 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
451 KMSG_CHECK = $(srctree)/scripts/kmsg-doc
452 NOSTDINC_FLAGS :=
453 CFLAGS_MODULE =
454 AFLAGS_MODULE =
455 LDFLAGS_MODULE =
456 CFLAGS_KERNEL =
457 AFLAGS_KERNEL =
458 LDFLAGS_vmlinux =
459
460 # Prefer linux-backports-modules
461 ifneq ($(KBUILD_SRC),)
462 ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
463 UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
464 endif
465 endif
466
467 # Use USERINCLUDE when you must reference the UAPI directories only.
468 USERINCLUDE := \
469 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
470 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
471 -I$(srctree)/include/uapi \
472 -I$(objtree)/include/generated/uapi \
473 -include $(srctree)/include/linux/kconfig.h
474
475 # Use LINUXINCLUDE when you must reference the include/ directory.
476 # Needed to be compatible with the O= option
477 LINUXINCLUDE := \
478 $(UBUNTUINCLUDE) \
479 -I$(srctree)/arch/$(SRCARCH)/include \
480 -I$(objtree)/arch/$(SRCARCH)/include/generated \
481 $(if $(building_out_of_srctree),-I$(srctree)/include) \
482 -I$(objtree)/include \
483 $(USERINCLUDE)
484
485 # UBUNTU: Include our third party driver stuff too
486 LINUXINCLUDE += -Iubuntu/include $(if $(KBUILD_SRC),-I$(srctree)/ubuntu/include)
487
488 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
489 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
490 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
491 -Werror=implicit-function-declaration -Werror=implicit-int \
492 -Wno-format-security \
493 -std=gnu89
494 KBUILD_CPPFLAGS := -D__KERNEL__
495 KBUILD_AFLAGS_KERNEL :=
496 KBUILD_CFLAGS_KERNEL :=
497 KBUILD_AFLAGS_MODULE := -DMODULE
498 KBUILD_CFLAGS_MODULE := -DMODULE
499 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
500 KBUILD_LDFLAGS :=
501 GCC_PLUGINS_CFLAGS :=
502 CLANG_FLAGS :=
503
504 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
505 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
506 export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
507 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
508
509 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
510 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
511 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
512 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
513 export KBUILD_KMSG_CHECK KMSG_CHECK
514 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
515 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
516 export KBUILD_ARFLAGS
517
518 # Files to ignore in find ... statements
519
520 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
521 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
522 -prune -o
523 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
524 --exclude CVS --exclude .pc --exclude .hg --exclude .git
525
526 # ===========================================================================
527 # Rules shared between *config targets and build targets
528
529 # Basic helpers built in scripts/basic/
530 PHONY += scripts_basic
531 scripts_basic:
532 $(Q)$(MAKE) $(build)=scripts/basic
533 $(Q)rm -f .tmp_quiet_recordmcount
534
535 PHONY += outputmakefile
536 # outputmakefile generates a Makefile in the output directory, if using a
537 # separate output directory. This allows convenient use of make in the
538 # output directory.
539 # At the same time when output Makefile generated, generate .gitignore to
540 # ignore whole output directory
541 outputmakefile:
542 ifdef building_out_of_srctree
543 $(Q)ln -fsn $(srctree) source
544 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
545 $(Q)test -e .gitignore || \
546 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
547 endif
548
549 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
550 ifneq ($(CROSS_COMPILE),)
551 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
552 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
553 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
554 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
555 endif
556 ifneq ($(GCC_TOOLCHAIN),)
557 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
558 endif
559 ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
560 CLANG_FLAGS += -no-integrated-as
561 endif
562 CLANG_FLAGS += -Werror=unknown-warning-option
563 KBUILD_CFLAGS += $(CLANG_FLAGS)
564 KBUILD_AFLAGS += $(CLANG_FLAGS)
565 export CLANG_FLAGS
566 endif
567
568 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
569 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
570 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
571 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
572 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
573
574 ifeq ($(config-targets),1)
575 # ===========================================================================
576 # *config targets only - make sure prerequisites are updated, and descend
577 # in scripts/kconfig to make the *config target
578
579 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
580 # KBUILD_DEFCONFIG may point out an alternative default configuration
581 # used for 'make defconfig'
582 include arch/$(SRCARCH)/Makefile
583 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
584
585 config: scripts_basic outputmakefile FORCE
586 $(Q)$(MAKE) $(build)=scripts/kconfig $@
587
588 %config: scripts_basic outputmakefile FORCE
589 $(Q)$(MAKE) $(build)=scripts/kconfig $@
590
591 else
592 # ===========================================================================
593 # Build targets only - this includes vmlinux, arch specific targets, clean
594 # targets and others. In general all targets except *config targets.
595
596 # If building an external module we do not care about the all: rule
597 # but instead _all depend on modules
598 PHONY += all
599 ifeq ($(KBUILD_EXTMOD),)
600 _all: all
601 else
602 _all: modules
603 endif
604
605 # Decide whether to build built-in, modular, or both.
606 # Normally, just do built-in.
607
608 KBUILD_MODULES :=
609 KBUILD_BUILTIN := 1
610
611 # If we have only "make modules", don't compile built-in objects.
612 # When we're building modules with modversions, we need to consider
613 # the built-in objects during the descend as well, in order to
614 # make sure the checksums are up to date before we record them.
615
616 ifeq ($(MAKECMDGOALS),modules)
617 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
618 endif
619
620 # If we have "make <whatever> modules", compile modules
621 # in addition to whatever we do anyway.
622 # Just "make" or "make all" shall build modules as well
623
624 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
625 KBUILD_MODULES := 1
626 endif
627
628 ifeq ($(MAKECMDGOALS),)
629 KBUILD_MODULES := 1
630 endif
631
632 export KBUILD_MODULES KBUILD_BUILTIN
633
634 ifeq ($(dot-config),1)
635 include include/config/auto.conf
636 endif
637
638 ifeq ($(KBUILD_EXTMOD),)
639 # Objects we will link into vmlinux / subdirs we need to visit
640 init-y := init/
641 drivers-y := drivers/ sound/ ubuntu/
642 drivers-$(CONFIG_SAMPLES) += samples/
643 drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
644 net-y := net/
645 libs-y := lib/
646 core-y := usr/
647 virt-y := virt/
648 endif # KBUILD_EXTMOD
649
650 # The all: target is the default when no target is given on the
651 # command line.
652 # This allow a user to issue only 'make' to build a kernel including modules
653 # Defaults to vmlinux, but the arch makefile usually adds further targets
654 all: vmlinux
655
656 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
657 $(call cc-option,-fno-tree-loop-im) \
658 $(call cc-disable-warning,maybe-uninitialized,)
659 export CFLAGS_GCOV
660
661 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
662 ifdef CONFIG_FUNCTION_TRACER
663 CC_FLAGS_FTRACE := -pg
664 endif
665
666 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
667 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
668 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
669 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
670 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
671 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
672 export RETPOLINE_CFLAGS
673 export RETPOLINE_VDSO_CFLAGS
674
675 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
676 # values of the respective KBUILD_* variables
677 ARCH_CPPFLAGS :=
678 ARCH_AFLAGS :=
679 ARCH_CFLAGS :=
680 include arch/$(SRCARCH)/Makefile
681
682 ifeq ($(dot-config),1)
683 ifeq ($(may-sync-config),1)
684 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
685 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
686 # because some architectures define CROSS_COMPILE there.
687 include include/config/auto.conf.cmd
688
689 $(KCONFIG_CONFIG):
690 @echo >&2 '***'
691 @echo >&2 '*** Configuration file "$@" not found!'
692 @echo >&2 '***'
693 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
694 @echo >&2 '*** "make menuconfig" or "make xconfig").'
695 @echo >&2 '***'
696 @/bin/false
697
698 # The actual configuration files used during the build are stored in
699 # include/generated/ and include/config/. Update them if .config is newer than
700 # include/config/auto.conf (which mirrors .config).
701 #
702 # This exploits the 'multi-target pattern rule' trick.
703 # The syncconfig should be executed only once to make all the targets.
704 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
705 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
706 else
707 # External modules and some install targets need include/generated/autoconf.h
708 # and include/config/auto.conf but do not care if they are up-to-date.
709 # Use auto.conf to trigger the test
710 PHONY += include/config/auto.conf
711
712 include/config/auto.conf:
713 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
714 echo >&2; \
715 echo >&2 " ERROR: Kernel configuration is invalid."; \
716 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
717 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
718 echo >&2 ; \
719 /bin/false)
720
721 endif # may-sync-config
722 endif # $(dot-config)
723
724 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
725 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
726 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
727 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
728 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
729
730 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
731 KBUILD_CFLAGS += -Os
732 else
733 KBUILD_CFLAGS += -O2
734 endif
735
736 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
737 KBUILD_CFLAGS += -Wno-maybe-uninitialized
738 endif
739
740 # Tell gcc to never replace conditional load with a non-conditional one
741 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
742
743 include scripts/Makefile.kcov
744 include scripts/Makefile.gcc-plugins
745
746 ifdef CONFIG_READABLE_ASM
747 # Disable optimizations that make assembler listings hard to read.
748 # reorder blocks reorders the control in the function
749 # ipa clone creates specialized cloned functions
750 # partial inlining inlines only parts of functions
751 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
752 $(call cc-option,-fno-ipa-cp-clone,) \
753 $(call cc-option,-fno-partial-inlining)
754 endif
755
756 ifneq ($(CONFIG_FRAME_WARN),0)
757 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
758 endif
759
760 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
761 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
762 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
763
764 KBUILD_CFLAGS += $(stackp-flags-y)
765
766 ifdef CONFIG_CC_IS_CLANG
767 KBUILD_CPPFLAGS += -Qunused-arguments
768 KBUILD_CFLAGS += -Wno-format-invalid-specifier
769 KBUILD_CFLAGS += -Wno-gnu
770 # Quiet clang warning: comparison of unsigned expression < 0 is always false
771 KBUILD_CFLAGS += -Wno-tautological-compare
772 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
773 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
774 # See modpost pattern 2
775 KBUILD_CFLAGS += -mno-global-merge
776 else
777
778 # These warnings generated too much noise in a regular build.
779 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
780 KBUILD_CFLAGS += -Wno-unused-but-set-variable
781
782 # Warn about unmarked fall-throughs in switch statement.
783 # Disabled for clang while comment to attribute conversion happens and
784 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
785 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
786 endif
787
788 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
789 ifdef CONFIG_FRAME_POINTER
790 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
791 else
792 # Some targets (ARM with Thumb2, for example), can't be built with frame
793 # pointers. For those, we don't have FUNCTION_TRACER automatically
794 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
795 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
796 # -fomit-frame-pointer with FUNCTION_TRACER.
797 ifndef CONFIG_FUNCTION_TRACER
798 KBUILD_CFLAGS += -fomit-frame-pointer
799 endif
800 endif
801
802 # Initialize all stack variables with a pattern, if desired.
803 ifdef CONFIG_INIT_STACK_ALL
804 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
805 endif
806
807 DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
808
809 ifdef CONFIG_DEBUG_INFO
810 ifdef CONFIG_DEBUG_INFO_SPLIT
811 DEBUG_CFLAGS += -gsplit-dwarf
812 else
813 DEBUG_CFLAGS += -g
814 endif
815 KBUILD_AFLAGS += -Wa,-gdwarf-2
816 endif
817 ifdef CONFIG_DEBUG_INFO_DWARF4
818 DEBUG_CFLAGS += -gdwarf-4
819 endif
820
821 ifdef CONFIG_DEBUG_INFO_REDUCED
822 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
823 $(call cc-option,-fno-var-tracking)
824 endif
825
826 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
827 export DEBUG_CFLAGS
828
829 ifdef CONFIG_FUNCTION_TRACER
830 ifdef CONFIG_FTRACE_MCOUNT_RECORD
831 # gcc 5 supports generating the mcount tables directly
832 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
833 CC_FLAGS_FTRACE += -mrecord-mcount
834 export CC_USING_RECORD_MCOUNT := 1
835 endif
836 ifdef CONFIG_HAVE_NOP_MCOUNT
837 ifeq ($(call cc-option-yn, -mnop-mcount),y)
838 CC_FLAGS_FTRACE += -mnop-mcount
839 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
840 endif
841 endif
842 endif
843 ifdef CONFIG_HAVE_FENTRY
844 ifeq ($(call cc-option-yn, -mfentry),y)
845 CC_FLAGS_FTRACE += -mfentry
846 CC_FLAGS_USING += -DCC_USING_FENTRY
847 endif
848 endif
849 export CC_FLAGS_FTRACE
850 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
851 KBUILD_AFLAGS += $(CC_FLAGS_USING)
852 ifdef CONFIG_DYNAMIC_FTRACE
853 ifdef CONFIG_HAVE_C_RECORDMCOUNT
854 BUILD_C_RECORDMCOUNT := y
855 export BUILD_C_RECORDMCOUNT
856 endif
857 endif
858 endif
859
860 # We trigger additional mismatches with less inlining
861 ifdef CONFIG_DEBUG_SECTION_MISMATCH
862 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
863 endif
864
865 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
866 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
867 LDFLAGS_vmlinux += --gc-sections
868 endif
869
870 ifdef CONFIG_LIVEPATCH
871 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
872 endif
873
874 # arch Makefile may override CC so keep this after arch Makefile is included
875 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
876
877 # warn about C99 declaration after statement
878 KBUILD_CFLAGS += -Wdeclaration-after-statement
879
880 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
881 KBUILD_CFLAGS += -Wvla
882
883 # disable pointer signed / unsigned warnings in gcc 4.0
884 KBUILD_CFLAGS += -Wno-pointer-sign
885
886 # disable stringop warnings in gcc 8+
887 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
888
889 # disable invalid "can't wrap" optimizations for signed / pointers
890 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
891
892 # clang sets -fmerge-all-constants by default as optimization, but this
893 # is non-conforming behavior for C and in fact breaks the kernel, so we
894 # need to disable it here generally.
895 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
896
897 # for gcc -fno-merge-all-constants disables everything, but it is fine
898 # to have actual conforming behavior enabled.
899 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
900
901 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
902 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
903
904 # conserve stack if available
905 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
906
907 # Prohibit date/time macros, which would make the build non-deterministic
908 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
909
910 # enforce correct pointer usage
911 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
912
913 # Require designated initializers for all marked structures
914 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
915
916 # change __FILE__ to the relative path from the srctree
917 KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
918
919 # ensure -fcf-protection is disabled when using retpoline as it is
920 # incompatible with -mindirect-branch=thunk-extern
921 ifdef CONFIG_RETPOLINE
922 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
923 endif
924
925 # use the deterministic mode of AR if available
926 KBUILD_ARFLAGS := $(call ar-option,D)
927
928 include scripts/Makefile.kasan
929 include scripts/Makefile.extrawarn
930 include scripts/Makefile.ubsan
931
932 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
933 # last assignments
934 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
935 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
936 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
937
938 KBUILD_LDFLAGS_MODULE += --build-id
939 LDFLAGS_vmlinux += --build-id
940
941 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
942 LDFLAGS_vmlinux += $(call ld-option, -X,)
943 endif
944
945 # insure the checker run with the right endianness
946 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
947
948 # the checker needs the correct machine size
949 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
950
951 # Default kernel image to build when no specific target is given.
952 # KBUILD_IMAGE may be overruled on the command line or
953 # set in the environment
954 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
955 # this default value
956 export KBUILD_IMAGE ?= vmlinux
957
958 #
959 # INSTALL_PATH specifies where to place the updated kernel and system map
960 # images. Default is /boot, but you can set it to other values
961 export INSTALL_PATH ?= /boot
962
963 #
964 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
965 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
966 # an argument if needed. Otherwise it defaults to the kernel install path
967 #
968 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
969
970 #
971 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
972 # relocations required by build roots. This is not defined in the
973 # makefile but the argument can be passed to make if needed.
974 #
975
976 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
977 export MODLIB
978
979 #
980 # INSTALL_MOD_STRIP, if defined, will cause modules to be
981 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
982 # the default option --strip-debug will be used. Otherwise,
983 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
984
985 ifdef INSTALL_MOD_STRIP
986 ifeq ($(INSTALL_MOD_STRIP),1)
987 mod_strip_cmd = $(STRIP) --strip-debug
988 else
989 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
990 endif # INSTALL_MOD_STRIP=1
991 else
992 mod_strip_cmd = true
993 endif # INSTALL_MOD_STRIP
994 export mod_strip_cmd
995
996 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
997 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
998 # or CONFIG_MODULE_COMPRESS_XZ.
999
1000 mod_compress_cmd = true
1001 ifdef CONFIG_MODULE_COMPRESS
1002 ifdef CONFIG_MODULE_COMPRESS_GZIP
1003 mod_compress_cmd = gzip -n -f
1004 endif # CONFIG_MODULE_COMPRESS_GZIP
1005 ifdef CONFIG_MODULE_COMPRESS_XZ
1006 mod_compress_cmd = xz -f
1007 endif # CONFIG_MODULE_COMPRESS_XZ
1008 endif # CONFIG_MODULE_COMPRESS
1009 export mod_compress_cmd
1010
1011 ifdef CONFIG_MODULE_SIG_ALL
1012 $(eval $(call config_filename,MODULE_SIG_KEY))
1013
1014 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1015 else
1016 mod_sign_cmd = true
1017 endif
1018 export mod_sign_cmd
1019
1020 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1021
1022 ifdef CONFIG_STACK_VALIDATION
1023 has_libelf := $(call try-run,\
1024 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1025 ifeq ($(has_libelf),1)
1026 objtool_target := tools/objtool FORCE
1027 else
1028 SKIP_STACK_VALIDATION := 1
1029 export SKIP_STACK_VALIDATION
1030 endif
1031 endif
1032
1033 PHONY += prepare0
1034
1035 export MODORDER := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order
1036
1037 ifeq ($(KBUILD_EXTMOD),)
1038 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1039
1040 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1041 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1042 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1043
1044 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1045 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1046 $(drivers-) $(net-) $(libs-) $(virt-))))
1047
1048 init-y := $(patsubst %/, %/built-in.a, $(init-y))
1049 core-y := $(patsubst %/, %/built-in.a, $(core-y))
1050 drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
1051 net-y := $(patsubst %/, %/built-in.a, $(net-y))
1052 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
1053 libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1054 virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
1055
1056 # Externally visible symbols (used by link-vmlinux.sh)
1057 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1058 $(drivers-y) $(net-y) $(virt-y)
1059 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1060 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1061 export LDFLAGS_vmlinux
1062 # used by scripts/package/Makefile
1063 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1064
1065 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1066
1067 # Recurse until adjust_autoksyms.sh is satisfied
1068 PHONY += autoksyms_recursive
1069 ifdef CONFIG_TRIM_UNUSED_KSYMS
1070 autoksyms_recursive: $(vmlinux-deps) modules.order
1071 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1072 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1073 endif
1074
1075 # For the kernel to actually contain only the needed exported symbols,
1076 # we have to build modules as well to determine what those symbols are.
1077 # (this can be evaluated only once include/config/auto.conf has been included)
1078 ifdef CONFIG_TRIM_UNUSED_KSYMS
1079 KBUILD_MODULES := 1
1080 endif
1081
1082 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1083
1084 $(autoksyms_h):
1085 $(Q)mkdir -p $(dir $@)
1086 $(Q)touch $@
1087
1088 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1089
1090 # Final link of vmlinux with optional arch pass after final link
1091 cmd_link-vmlinux = \
1092 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \
1093 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1094
1095 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1096 +$(call if_changed,link-vmlinux)
1097
1098 targets := vmlinux
1099
1100 # The actual objects are generated when descending,
1101 # make sure no implicit rule kicks in
1102 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1103
1104 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1105 # Preset locale variables to speed up the build process. Limit locale
1106 # tweaks to this spot to avoid wrong language settings when running
1107 # make menuconfig etc.
1108 # Error messages still appears in the original language
1109
1110 PHONY += $(vmlinux-dirs)
1111 $(vmlinux-dirs): prepare
1112 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1
1113
1114 filechk_kernel.release = \
1115 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1116
1117 # Store (new) KERNELRELEASE string in include/config/kernel.release
1118 include/config/kernel.release: FORCE
1119 $(call filechk,kernel.release)
1120
1121 # Additional helpers built in scripts/
1122 # Carefully list dependencies so we do not try to build scripts twice
1123 # in parallel
1124 PHONY += scripts
1125 scripts: scripts_basic scripts_dtc
1126 $(Q)$(MAKE) $(build)=$(@)
1127
1128 # Things we need to do before we recursively start building the kernel
1129 # or the modules are listed in "prepare".
1130 # A multi level approach is used. prepareN is processed before prepareN-1.
1131 # archprepare is used in arch Makefiles and when processed asm symlink,
1132 # version.h and scripts_basic is processed / created.
1133
1134 PHONY += prepare archprepare prepare3
1135
1136 # prepare3 is used to check if we are building in a separate output directory,
1137 # and if so do:
1138 # 1) Check that make has not been executed in the kernel src $(srctree)
1139 prepare3: include/config/kernel.release
1140 ifdef building_out_of_srctree
1141 @$(kecho) ' Using $(srctree) as source for kernel'
1142 $(Q)if [ -f $(srctree)/.config -o \
1143 -d $(srctree)/include/config -o \
1144 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
1145 echo >&2 " $(srctree) is not clean, please run 'make ARCH=$(ARCH) mrproper'"; \
1146 echo >&2 " in the '$(srctree)' directory.";\
1147 /bin/false; \
1148 fi;
1149 endif
1150
1151 archprepare: archheaders archscripts scripts prepare3 outputmakefile \
1152 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1153
1154 prepare0: archprepare
1155 $(Q)$(MAKE) $(build)=scripts/mod
1156 $(Q)$(MAKE) $(build)=.
1157
1158 # All the preparing..
1159 prepare: prepare0 prepare-objtool
1160
1161 # Support for using generic headers in asm-generic
1162 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1163
1164 PHONY += asm-generic uapi-asm-generic
1165 asm-generic: uapi-asm-generic
1166 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1167 generic=include/asm-generic
1168 uapi-asm-generic:
1169 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1170 generic=include/uapi/asm-generic
1171
1172 PHONY += prepare-objtool
1173 prepare-objtool: $(objtool_target)
1174 ifeq ($(SKIP_STACK_VALIDATION),1)
1175 ifdef CONFIG_UNWINDER_ORC
1176 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1177 @false
1178 else
1179 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1180 endif
1181 endif
1182
1183 # Generate some files
1184 # ---------------------------------------------------------------------------
1185
1186 # KERNELRELEASE can change from a few different places, meaning version.h
1187 # needs to be updated, so this check is forced on all builds
1188
1189 uts_len := 64
1190 define filechk_utsrelease.h
1191 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1192 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1193 exit 1; \
1194 fi; \
1195 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1196 endef
1197
1198 define filechk_version.h
1199 echo \#define LINUX_VERSION_CODE $(shell \
1200 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1201 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1202 endef
1203
1204 $(version_h): FORCE
1205 $(call filechk,version.h)
1206 $(Q)rm -f $(old_version_h)
1207
1208 include/generated/utsrelease.h: include/config/kernel.release FORCE
1209 $(call filechk,utsrelease.h)
1210
1211 PHONY += headerdep
1212 headerdep:
1213 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1214 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1215
1216 # ---------------------------------------------------------------------------
1217 # Kernel headers
1218
1219 #Default location for installed headers
1220 export INSTALL_HDR_PATH = $(objtree)/usr
1221
1222 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1223 cmd_headers_install = \
1224 mkdir -p $(INSTALL_HDR_PATH); \
1225 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1226 usr/include $(INSTALL_HDR_PATH)
1227
1228 PHONY += headers_install
1229 headers_install: headers
1230 $(call cmd,headers_install)
1231
1232 PHONY += archheaders archscripts
1233
1234 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1235
1236 PHONY += headers
1237 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1238 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1239 $(error Headers not exportable for the $(SRCARCH) architecture))
1240 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1241 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1242 $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1243
1244 PHONY += headers_check
1245 headers_check: headers
1246 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1247 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1248 $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders= HDRCHECK=1
1249
1250 ifdef CONFIG_HEADERS_INSTALL
1251 prepare: headers
1252 endif
1253
1254 ifdef CONFIG_HEADERS_CHECK
1255 all: headers_check
1256 endif
1257
1258 PHONY += scripts_unifdef
1259 scripts_unifdef: scripts_basic
1260 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1261
1262 # ---------------------------------------------------------------------------
1263 # Kernel selftest
1264
1265 PHONY += kselftest
1266 kselftest:
1267 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1268
1269 PHONY += kselftest-clean
1270 kselftest-clean:
1271 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1272
1273 PHONY += kselftest-merge
1274 kselftest-merge:
1275 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1276 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1277 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1278 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1279
1280 # ---------------------------------------------------------------------------
1281 # Devicetree files
1282
1283 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1284 dtstree := arch/$(SRCARCH)/boot/dts
1285 endif
1286
1287 ifneq ($(dtstree),)
1288
1289 %.dtb: prepare3 scripts_dtc
1290 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1291
1292 PHONY += dtbs dtbs_install dt_binding_check
1293 dtbs dtbs_check: prepare3 scripts_dtc
1294 $(Q)$(MAKE) $(build)=$(dtstree)
1295
1296 dtbs_check: export CHECK_DTBS=1
1297 dtbs_check: dt_binding_check
1298
1299 dtbs_install:
1300 $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1301
1302 ifdef CONFIG_OF_EARLY_FLATTREE
1303 all: dtbs
1304 endif
1305
1306 endif
1307
1308 PHONY += scripts_dtc
1309 scripts_dtc: scripts_basic
1310 $(Q)$(MAKE) $(build)=scripts/dtc
1311
1312 dt_binding_check: scripts_dtc
1313 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1314
1315 # ---------------------------------------------------------------------------
1316 # Modules
1317
1318 ifdef CONFIG_MODULES
1319
1320 # By default, build modules as well
1321
1322 all: modules
1323
1324 # Build modules
1325 #
1326 # A module can be listed more than once in obj-m resulting in
1327 # duplicate lines in modules.order files. Those are removed
1328 # using awk while concatenating to the final file.
1329
1330 PHONY += modules
1331 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1332 @$(kecho) ' Building modules, stage 2.';
1333 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1334 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1335
1336 modules.order: $(vmlinux-dirs)
1337 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1338
1339 modbuiltin-dirs := $(addprefix _modbuiltin_, $(vmlinux-dirs))
1340
1341 modules.builtin: $(modbuiltin-dirs)
1342 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1343
1344 PHONY += $(modbuiltin-dirs)
1345 # tristate.conf is not included from this Makefile. Add it as a prerequisite
1346 # here to make it self-healing in case somebody accidentally removes it.
1347 $(modbuiltin-dirs): include/config/tristate.conf
1348 $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1349
1350 # Target to prepare building external modules
1351 PHONY += modules_prepare
1352 modules_prepare: prepare
1353
1354 # Target to install modules
1355 PHONY += modules_install
1356 modules_install: _modinst_ _modinst_post
1357
1358 PHONY += _modinst_
1359 _modinst_:
1360 @rm -rf $(MODLIB)/kernel
1361 @rm -f $(MODLIB)/source
1362 @mkdir -p $(MODLIB)/kernel
1363 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1364 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1365 rm -f $(MODLIB)/build ; \
1366 ln -s $(CURDIR) $(MODLIB)/build ; \
1367 fi
1368 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1369 @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1370 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1371 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1372
1373 # This depmod is only for convenience to give the initial
1374 # boot a modules.dep even before / is mounted read-write. However the
1375 # boot script depmod is the master version.
1376 PHONY += _modinst_post
1377 _modinst_post: _modinst_
1378 $(call cmd,depmod)
1379
1380 ifeq ($(CONFIG_MODULE_SIG), y)
1381 PHONY += modules_sign
1382 modules_sign:
1383 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1384 endif
1385
1386 else # CONFIG_MODULES
1387
1388 # Modules not configured
1389 # ---------------------------------------------------------------------------
1390
1391 PHONY += modules modules_install
1392 modules modules_install:
1393 @echo >&2
1394 @echo >&2 "The present kernel configuration has modules disabled."
1395 @echo >&2 "Type 'make config' and enable loadable module support."
1396 @echo >&2 "Then build a kernel with module support enabled."
1397 @echo >&2
1398 @exit 1
1399
1400 endif # CONFIG_MODULES
1401
1402 ###
1403 # Cleaning is done on three levels.
1404 # make clean Delete most generated files
1405 # Leave enough to build external modules
1406 # make mrproper Delete the current configuration, and all generated files
1407 # make distclean Remove editor backup files, patch leftover files and the like
1408
1409 # Directories & files removed with 'make clean'
1410 CLEAN_DIRS += include/ksym
1411 CLEAN_FILES += modules.builtin.modinfo
1412
1413 # Directories & files removed with 'make mrproper'
1414 MRPROPER_DIRS += include/config include/generated \
1415 arch/$(SRCARCH)/include/generated .tmp_objdiff
1416 MRPROPER_FILES += .config .config.old .version \
1417 Module.symvers \
1418 signing_key.pem signing_key.priv signing_key.x509 \
1419 x509.genkey extra_certificates signing_key.x509.keyid \
1420 signing_key.x509.signer vmlinux-gdb.py
1421
1422 # Directories & files removed with 'make distclean'
1423 DISTCLEAN_DIRS +=
1424 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1425
1426 # clean - Delete most, but leave enough to build external modules
1427 #
1428 clean: rm-dirs := $(CLEAN_DIRS)
1429 clean: rm-files := $(CLEAN_FILES)
1430 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs))
1431
1432 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1433 $(clean-dirs):
1434 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1435
1436 vmlinuxclean:
1437 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1438 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1439
1440 clean: archclean vmlinuxclean
1441
1442 # mrproper - Delete all generated files, including .config
1443 #
1444 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1445 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1446 mrproper-dirs := $(addprefix _mrproper_,scripts)
1447
1448 PHONY += $(mrproper-dirs) mrproper
1449 $(mrproper-dirs):
1450 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1451
1452 mrproper: clean $(mrproper-dirs)
1453 $(call cmd,rmdirs)
1454 $(call cmd,rmfiles)
1455
1456 # distclean
1457 #
1458 distclean: rm-dirs := $(wildcard $(DISTCLEAN_DIRS))
1459 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1460
1461 PHONY += distclean
1462
1463 distclean: mrproper
1464 $(call cmd,rmdirs)
1465 $(call cmd,rmfiles)
1466 @find $(srctree) $(RCS_FIND_IGNORE) \
1467 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1468 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1469 -o -name 'core' \) \
1470 -type f -print | xargs rm -f
1471
1472
1473 # Packaging of the kernel to various formats
1474 # ---------------------------------------------------------------------------
1475 package-dir := scripts/package
1476
1477 %src-pkg: FORCE
1478 $(Q)$(MAKE) $(build)=$(package-dir) $@
1479 %pkg: include/config/kernel.release FORCE
1480 $(Q)$(MAKE) $(build)=$(package-dir) $@
1481
1482
1483 # Brief documentation of the typical targets used
1484 # ---------------------------------------------------------------------------
1485
1486 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1487 boards := $(sort $(notdir $(boards)))
1488 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1489 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1490
1491 PHONY += help
1492 help:
1493 @echo 'Cleaning targets:'
1494 @echo ' clean - Remove most generated files but keep the config and'
1495 @echo ' enough build support to build external modules'
1496 @echo ' mrproper - Remove all generated files + config + various backup files'
1497 @echo ' distclean - mrproper + remove editor backup and patch files'
1498 @echo ''
1499 @echo 'Configuration targets:'
1500 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1501 @echo ''
1502 @echo 'Other generic targets:'
1503 @echo ' all - Build all targets marked with [*]'
1504 @echo '* vmlinux - Build the bare kernel'
1505 @echo '* modules - Build all modules'
1506 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1507 @echo ' dir/ - Build all files in dir and below'
1508 @echo ' dir/file.[ois] - Build specified target only'
1509 @echo ' dir/file.ll - Build the LLVM assembly file'
1510 @echo ' (requires compiler support for LLVM assembly generation)'
1511 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1512 @echo ' (requires a recent binutils and recent build (System.map))'
1513 @echo ' dir/file.ko - Build module including final link'
1514 @echo ' modules_prepare - Set up for building external modules'
1515 @echo ' tags/TAGS - Generate tags file for editors'
1516 @echo ' cscope - Generate cscope index'
1517 @echo ' gtags - Generate GNU GLOBAL index'
1518 @echo ' kernelrelease - Output the release version string (use with make -s)'
1519 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1520 @echo ' image_name - Output the image name (use with make -s)'
1521 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1522 echo ' (default: $(INSTALL_HDR_PATH))'; \
1523 echo ''
1524 @echo 'Static analysers:'
1525 @echo ' checkstack - Generate a list of stack hogs'
1526 @echo ' namespacecheck - Name space analysis on compiled kernel'
1527 @echo ' versioncheck - Sanity check on version.h usage'
1528 @echo ' includecheck - Check for duplicate included header files'
1529 @echo ' export_report - List the usages of all exported symbols'
1530 @echo ' headers_check - Sanity check on exported headers'
1531 @echo ' headerdep - Detect inclusion cycles in headers'
1532 @echo ' coccicheck - Check with Coccinelle'
1533 @echo ''
1534 @echo 'Kernel selftest:'
1535 @echo ' kselftest - Build and run kernel selftest (run as root)'
1536 @echo ' Build, install, and boot kernel before'
1537 @echo ' running kselftest on it'
1538 @echo ' kselftest-clean - Remove all generated kselftest files'
1539 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1540 @echo ' .config.'
1541 @echo ''
1542 @$(if $(dtstree), \
1543 echo 'Devicetree:'; \
1544 echo '* dtbs - Build device tree blobs for enabled boards'; \
1545 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1546 echo '')
1547
1548 @echo 'Userspace tools targets:'
1549 @echo ' use "make tools/help"'
1550 @echo ' or "cd tools; make help"'
1551 @echo ''
1552 @echo 'Kernel packaging:'
1553 @$(MAKE) $(build)=$(package-dir) help
1554 @echo ''
1555 @echo 'Documentation targets:'
1556 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1557 @echo ''
1558 @echo 'Architecture specific targets ($(SRCARCH)):'
1559 @$(if $(archhelp),$(archhelp),\
1560 echo ' No architecture specific help defined for $(SRCARCH)')
1561 @echo ''
1562 @$(if $(boards), \
1563 $(foreach b, $(boards), \
1564 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1565 echo '')
1566 @$(if $(board-dirs), \
1567 $(foreach b, $(board-dirs), \
1568 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1569 printf " %-16s - Show all of the above\\n" help-boards; \
1570 echo '')
1571
1572 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1573 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1574 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1575 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1576 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1577 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1578 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1579 @echo ' 1: warnings which may be relevant and do not occur too often'
1580 @echo ' 2: warnings which occur quite often but may still be relevant'
1581 @echo ' 3: more obscure warnings, can most likely be ignored'
1582 @echo ' Multiple levels can be combined with W=12 or W=123'
1583 @echo ''
1584 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1585 @echo 'For further info see the ./README file'
1586
1587
1588 help-board-dirs := $(addprefix help-,$(board-dirs))
1589
1590 help-boards: $(help-board-dirs)
1591
1592 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1593
1594 $(help-board-dirs): help-%:
1595 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1596 @$(if $(boards-per-dir), \
1597 $(foreach b, $(boards-per-dir), \
1598 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1599 echo '')
1600
1601
1602 # Documentation targets
1603 # ---------------------------------------------------------------------------
1604 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1605 linkcheckdocs dochelp refcheckdocs
1606 PHONY += $(DOC_TARGETS)
1607 $(DOC_TARGETS): scripts_basic FORCE
1608 $(Q)$(MAKE) $(build)=Documentation $@
1609
1610 # Misc
1611 # ---------------------------------------------------------------------------
1612
1613 PHONY += scripts_gdb
1614 scripts_gdb: prepare0
1615 $(Q)$(MAKE) $(build)=scripts/gdb
1616 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1617
1618 ifdef CONFIG_GDB_SCRIPTS
1619 all: scripts_gdb
1620 endif
1621
1622 else # KBUILD_EXTMOD
1623
1624 ###
1625 # External module support.
1626 # When building external modules the kernel used as basis is considered
1627 # read-only, and no consistency checks are made and the make
1628 # system is not used on the basis kernel. If updates are required
1629 # in the basis kernel ordinary make commands (without M=...) must
1630 # be used.
1631 #
1632 # The following are the only valid targets when building external
1633 # modules.
1634 # make M=dir clean Delete all automatically generated files
1635 # make M=dir modules Make all modules in specified dir
1636 # make M=dir Same as 'make M=dir modules'
1637 # make M=dir modules_install
1638 # Install the modules built in the module directory
1639 # Assumes install directory is already created
1640
1641 # We are always building modules
1642 KBUILD_MODULES := 1
1643
1644 PHONY += $(objtree)/Module.symvers
1645 $(objtree)/Module.symvers:
1646 @test -e $(objtree)/Module.symvers || ( \
1647 echo; \
1648 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1649 echo " is missing; modules will have no dependencies and modversions."; \
1650 echo )
1651
1652 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1653 PHONY += $(module-dirs) modules
1654 $(module-dirs): prepare $(objtree)/Module.symvers
1655 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) need-modorder=1
1656
1657 modules: $(module-dirs)
1658 @$(kecho) ' Building modules, stage 2.';
1659 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1660
1661 PHONY += modules_install
1662 modules_install: _emodinst_ _emodinst_post
1663
1664 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1665 PHONY += _emodinst_
1666 _emodinst_:
1667 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1668 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1669
1670 PHONY += _emodinst_post
1671 _emodinst_post: _emodinst_
1672 $(call cmd,depmod)
1673
1674 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1675
1676 PHONY += $(clean-dirs) clean
1677 $(clean-dirs):
1678 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1679
1680 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1681
1682 PHONY += help
1683 help:
1684 @echo ' Building external modules.'
1685 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1686 @echo ''
1687 @echo ' modules - default target, build the module(s)'
1688 @echo ' modules_install - install the module'
1689 @echo ' clean - remove generated files in module directory only'
1690 @echo ''
1691
1692 PHONY += prepare
1693 endif # KBUILD_EXTMOD
1694
1695 clean: $(clean-dirs)
1696 $(call cmd,rmdirs)
1697 $(call cmd,rmfiles)
1698 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1699 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1700 -o -name '*.ko.*' \
1701 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1702 -o -name '*.dwo' -o -name '*.lst' \
1703 -o -name '*.su' -o -name '*.mod' \
1704 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1705 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1706 -o -name '*.asn1.[ch]' \
1707 -o -name '*.symtypes' -o -name 'modules.order' \
1708 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1709 -o -name '*.c.[012]*.*' \
1710 -o -name '*.ll' \
1711 -o -name '*.gcno' \) -type f -print | xargs rm -f
1712
1713 # Generate tags for editors
1714 # ---------------------------------------------------------------------------
1715 quiet_cmd_tags = GEN $@
1716 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1717
1718 tags TAGS cscope gtags: FORCE
1719 $(call cmd,tags)
1720
1721 # Scripts to check various things for consistency
1722 # ---------------------------------------------------------------------------
1723
1724 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1725
1726 includecheck:
1727 find $(srctree)/* $(RCS_FIND_IGNORE) \
1728 -name '*.[hcS]' -type f -print | sort \
1729 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1730
1731 versioncheck:
1732 find $(srctree)/* $(RCS_FIND_IGNORE) \
1733 -name '*.[hcS]' -type f -print | sort \
1734 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1735
1736 coccicheck:
1737 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1738
1739 namespacecheck:
1740 $(PERL) $(srctree)/scripts/namespace.pl
1741
1742 export_report:
1743 $(PERL) $(srctree)/scripts/export_report.pl
1744
1745 PHONY += checkstack kernelrelease kernelversion image_name
1746
1747 # UML needs a little special treatment here. It wants to use the host
1748 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1749 # else wants $(ARCH), including people doing cross-builds, which means
1750 # that $(SUBARCH) doesn't work here.
1751 ifeq ($(ARCH), um)
1752 CHECKSTACK_ARCH := $(SUBARCH)
1753 else
1754 CHECKSTACK_ARCH := $(ARCH)
1755 endif
1756 checkstack:
1757 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1758 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1759
1760 kernelrelease:
1761 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1762
1763 kernelversion:
1764 @echo $(KERNELVERSION)
1765
1766 image_name:
1767 @echo $(KBUILD_IMAGE)
1768
1769 # Clear a bunch of variables before executing the submake
1770
1771 ifeq ($(quiet),silent_)
1772 tools_silent=s
1773 endif
1774
1775 tools/: FORCE
1776 $(Q)mkdir -p $(objtree)/tools
1777 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1778
1779 tools/%: FORCE
1780 $(Q)mkdir -p $(objtree)/tools
1781 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1782
1783 # Single targets
1784 # ---------------------------------------------------------------------------
1785 # Single targets are compatible with:
1786 # - build with mixed source and output
1787 # - build with separate output dir 'make O=...'
1788 # - external modules
1789 #
1790 # target-dir => where to store outputfile
1791 # build-dir => directory in kernel source tree to use
1792
1793 build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@
1794 build-dir = $(patsubst %/,%,$(dir $(build-target)))
1795
1796 %.i: prepare FORCE
1797 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1798 %.ll: prepare FORCE
1799 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1800 %.lst: prepare FORCE
1801 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1802 %.o: prepare FORCE
1803 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1804 %.s: prepare FORCE
1805 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1806 %.symtypes: prepare FORCE
1807 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1808 ifeq ($(KBUILD_EXTMOD),)
1809 # For the single build of an in-tree module, use a temporary file to avoid
1810 # the situation of modules_install installing an invalid modules.order.
1811 %.ko: MODORDER := .modules.tmp
1812 endif
1813 %.ko: prepare FORCE
1814 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target:.ko=.mod)
1815 $(Q)echo $(build-target) > $(MODORDER)
1816 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1817
1818 # Modules
1819 PHONY += /
1820 /: ./
1821
1822 %/: prepare FORCE
1823 $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir) need-modorder=1
1824
1825 # FIXME Should go into a make.lib or something
1826 # ===========================================================================
1827
1828 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1829 cmd_rmdirs = rm -rf $(rm-dirs)
1830
1831 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1832 cmd_rmfiles = rm -f $(rm-files)
1833
1834 # Run depmod only if we have System.map and depmod is executable
1835 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1836 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1837 $(KERNELRELEASE)
1838
1839 # read saved command lines for existing targets
1840 existing-targets := $(wildcard $(sort $(targets)))
1841
1842 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1843
1844 endif # ifeq ($(config-targets),1)
1845 endif # ifeq ($(mixed-targets),1)
1846 endif # need-sub-make
1847
1848 PHONY += FORCE
1849 FORCE:
1850
1851 # Declare the contents of the PHONY variable as phony. We keep that
1852 # information in a variable so we can use it in if_changed and friends.
1853 .PHONY: $(PHONY)